Wedge slip for rotaries



March 11, 1.930. J. w. KAOUGH 1,749,945 l WEDGE SLIP FOR ROTARIES Filed June '7, 1928 2 Sheets-Sheer l March ll, 1.930. J. w. KAouGH 1,749,946

WEDGE SLIP FOR ROTARIEQ Filed June '7, 1928 2 sheets-sheer 2 1N VENTO/e A TT ORNE Y Patented Mar. l1, 1930 PATENT OFFICE A JOSEPH W. KAOUGH, F NEAR HOUSTON, TEXAS WEDGE SL11' Fon ROTARIES Application, led June 7, 1928. Seriallo. 283,591.

This invention relates to a wedge slip for rotaries, and particularly tov a construction by which the wedging action of they slip is supplemented by a pressure of thek bushing f5 thereon to eiect sufficient grip lupon a. pipe to ena-blea string thereof to be connected or disconnected vat the coupled joints.

VThe 'ordinary Wedge slip is designedV to support the pipe or rod aga-inst downward I0 movement and if used in connection with a rotary there is liable to be a circumferential movement ofthe slip upon the pi e which particularly defeats the proper ho ding of the pipe for breaking out or'unscrewing the 715 pipe sections. It is also desirable to` avoid any tilting or rocking of the slip upon the pipe which would cause an edge lof the slip to bite or cut into thepipe, so that it becomes important that the ent-ire ripping face of the '20 slip lshould be constantly eld in contact with the pipe.

To avoid the objectionsjust noted and'provide a more eicient construction this invention 4presents a form vof slip wherein the grip- /25 ping tace is concentric to the axis of the slip and the outer Wedging face is eccentric .to the gripping face and `fitted into contact with a corresponding eccentric face upon `the enclosing bushing which yis actuated bythe rol '30 tary. The invention also contemplates the use of slantingor spiral teeth upon lthe gripping face of the slip which assist ineiecting firm Vengagement in the rotary action y of the bushing.

35 further object vof the invention Ais toapply'this .eccentric mounting to :a -slip section formed cfa plurality of superposed segments mounted for longitudinal movement upon a connector 'and for a lateral movement in the '4 bending of such connector.

and the novel features thereof defined by the appended claims.

VIn the drawin-gsy Figure 1 is a top plan of the assembled Slips;

Figure 2 is an elevation of one slip section;

Figure 3 is an enlarged section through slip segments;

Figuref; isa plan of a modified form of the invention;

Figure 5 is an 4elevation of the slip use therein; and

Figure 6 is a similar View of a further modied form of slip.

Like numerals of reference indicate like parts in the several figures of the drawings.

In the preferred 'form of the invention shown in Figures 1, 2 and 3 the slip sections 10am-composed of a plurality of superposed segments 11 lmounted upon connectors 13 extending through 'apertures 14 in the segments. These connectors are joined at the handle 15 and provided with stops 16 to prevent the segmentsengaging the handle when the slip is not in use.

The lowermost -segment is secured to the connector and the uppermost segments are movable longitudinally thereon. The apertures '14 are flared or enlarged at'their ends 17and the connector isbendable laterally and fits the apertures so that the segments will shift laterally with'the cable, while the flared ends prevent shea/ring wear thereon. When the segments are set inoperative position the apertures are out of direct alinement, but when removed 'from their bushing and suspended lby 'the connector cable it will straighten and shift the segments laterally to insure their introduction into the bushing without 4engagement with the upper edge thereof.

-The beforernentioned parts are not claimed in this application as Vthey form the subject of my copending application filed June 7, 1928, Serial No. 283,590.

The invention provides for an eccentric action upon ythe slips transverse of their wedging movement in a substantially vertical plane, andfor this -purpose each slip is `formed with lits inner gripping face '2O ried by the usual rotary,1indicated at `24,- byivhich motion is imparted thereto..

It will be observed that the slip sections 10 are spaced from each other at their adp),-

cent ends, as at 25, to permit a limited movement "in one direction', generally counter clockwise, and movement of tlieslips in an opposite direction is prevented by end Walls .26 Lof the bushing sections.

The gripping faces of the segments forming the slip are Yformed `with teeth spirally Vdisposed or inclined at an angle to the vertical and these teeth are formed with flat faces 27 Ato prevent cutting the pipe, horizontal faces 28 to give the toothdepth, and connecting bevelled faces 29 connecting the faces 27 and 28. In the event of any rotary slipping of the wedge members the inclination of the teeth effects firm engagement with the pipe and a screw-thread like actionthereon to secure the pipe within the slips. v e

' In the modifications shown in Figures 4, 5 and-6 the slips 30 are each formed as a solid unit, as distinguished from the movable segmentsshown in Figures 1, 2 and 3. This c vslip is provided with the usual pivotedhandle 31 and-its inner gripping face '32 is dis-` posed concentric tothe axis of the assembled slips, while its outer wedging face 33 is eccentric to said axis and to the face 32, as ybefore described. The bushing 34 is provided with an inner eccentric face 35 corresponding to that of the slip, andthe bushing is supported I, lin therotary 36 -in the usual manner. In

Figure 5 the gripping face ofthe slip is shown as provided with spirallyV arranged teethr 37, such as described in, connection with Figure 3. In Figure 6 the teeth 38 are disposed in parallel horizontal planes in the customary manner, but otherwise this form is pro- Y vided with the concentric and eccentric *facesV on theV slip as explained -in connectionwith FigureAf.

Y The general operation of the inventionwill be apparent from the foregoing description from which it will be seen that in the clockwisemovement of therotary theresistance oiinered by the pipe is anti-'clock-wise, and

V therefore any slipping movement of the slips would be in the latter .direction and ,the eccentric action tends to tighten the'slips. `The grip of the slipsis also facilitatedl by the' slant of the teeth which is usually downward toward the right as greater force is necessary for breaking-out the pipe joints than for connecting the same. In screwing up astring of pipe an Yordinary connection is made and the tightening effected during subsequent drilling, so that it is not necessary to provide the teeth on the opposite slip with a left hand downward slant: simple, very ecient, and economically manu'- The invention presents ay factured construction of wedge slip particu- Y.

larly adapted forrotaries, and one in which there is a cooperative action between the eclcentricinounting and the slip formedof assembled segments capable of vertical .andy horizontalmovements relative to each other. The specific construction of the invention i has beenshown and described but the invention is not confined thereto las changes and alterationsmay be madetherein withoutdeparting from the Vspirit ofv the invention face upon the slip and meansfor imparting p rotary movement to said member toshift the same upoiithe outer slip face. K c

2,.V In a wedge slip'device for rotaries, a

plurality of superimposed slip sections, each having fa gripping face concentric' with YtheV laxis of thedevice and an outer lwedge face formed `eccentric yto the corresponding grip-,VY ping face, andan enclosing member-having an eccentric face engaging 'the eccentric. faces of saidl sections,psaid sections Vbeing mounted for limitedfcircuinferential movement upon said enclosing member-relative to l c i;V -V

each other. n V 3. In a wedge slip device for rotaries, a pluralityof superimposed slip sections,eachhavy ing a gripping'face concentric withthe axis 'of the device and an outer wedge face formed 1 eccentric to the corresponding gripping face, and a bushing surrounding said sections and having separate inner eccentric-faces to continuously contact with theeccentric yfaces of the slip sections. 'f

' 4. In a `wedge slip device for rotaries, opposite slip members each having a gripping face concentricto the axis ofI the'device and the circumferentially.r increasing thickness yof c n the member, and a ,bushingl having opposite eccentric facescontinuously engaginglthe eccentric faces of the members and being ofk l greater circumferential length to permit limited movement thereon in one direction.

Y 5. In a wedge slip device for rotaries, `opankouter eccentric wedging face formed by. i

eccentric faces continuously engaging the eccentric faces of the members and being of greater circumferential length to permit limited movement thereon in one direction, said bushing being formed with abutments to limit a rotative movement in an opposite direction.

6. A Wedge slip device for rotaries compri sing a plurality of superimposed slip segments each having an inner gripping face concentric to the axis of the device and an outer Wedging face eccentric to the corresponding gripping face, a bushing having an eccentric face engaging the corresponding faces ofthe segments, and a connector for the segments upon which they are mounted for axial movement independent of each other.

7. A Wedge slip device as deined by claim 6 in which the connector is laterally bendable to permit horizontal shifting of the superimposed segments upon each other.

8. A Wedge slip device for a. rotary comprising a plurality of segments each having an inner gripping face formed With spirally disposed teeth to effect threaded engagement With an object and an outer Wedge face disposed eccentric to the axis of the device, and a rotative bushing having an eccentric inner face continuously engaging the eccentric faces of the segments.

so In testimony whereof I aiX my signature.

JOSEPH W. KAOUGH. 

